A healthcare worker holds a dose of the Johnson & Johnson vaccine against the COVID-19 coronavirus as South Africa proceeds with its inoculation campaign at the Klerksdorp Hospital on February 18, 2021.
Phill Magakoe | AFP | Getty Images
Europe's drug regulator said on Friday authorities in the region were aware that a batch of the active substance used in Johnson & Johnson's COVID-19 vaccine had been contaminated with materials for another shot made at the same site.